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Prologue — Two Forks of Money, and the `<5초 settlement` Era

In May 2026 payment infrastructure evolved along two tracks. First, central bank digital currencies (CBDCs) issued directly by central banks. Second, private stablecoins that mirror fiat value but are issued by private firms. Both are "tokenized money," yet **issuer, regulation, and settlement risk all differ**.

The PBoCs e-CNY crossed `1.8조 위안` in cumulative transaction volume in Q1 2026. The Bank of Korea is rolling out Phase 1 and Phase 2 of its CBDC simulation across 2024-2026; Phase 2 enlists 100 citizens and four pilot banks (Woori, Shinhan, Hana, IBK). The Bank of Japan completed Phases 1-3 of its digital yen proof-of-concept between 2023 and 2026 and is weighing an issuance decision after 2027.

The ECB launched the Preparation Phase for the Digital Euro in October 2023 and uses 2025-2027 to finalize legislation and technical standards. The Fed shipped FedNow in 2023 as a 24/7 real-time payments rail but has no statutory authority to issue a digital dollar — Project Hamilton (MIT partnership) and Project Cedar (NY Fed) remain research tracks.

On the private side, stablecoin market cap exceeded `$170B` in May 2026. USDT runs `$110B+`, USDC `$45B+`, with DAI, PYUSD, FDUSD, and GHO trailing. The EUs MiCA imposes a daily volume cap of `€200M` on EUR-denominated stablecoins from non-EUR issuers, and Circle obtained an E-money Token license in France in 2024.

In Korea the Virtual Asset User Protection Act entered force in July 2024, mandating exchange segregation of customer deposits and hack indemnification. A KRW stablecoin has not yet been issued, but in 2026 KB Kookmin, Shinhan, Hana, and Woori are reviewing a KRW-pegged token under the STO track. Japan amended its Payment Services Act in 2023 to create the PSC (Payment Stablecoin) license, and Mizuho, MUFG, and SBI are preparing as issuers.

This piece draws that map: what CBDCs and stablecoins are, why they diverged, how they are architected, and how they are regulated.

Chapter 1 · CBDC 2-tier Architecture — Wholesale vs Retail

CBDCs split into two categories by user.

| Dimension | Wholesale CBDC | Retail CBDC |

| --- | --- | --- |

| Users | Banks, FIs | Citizens, firms |

| Ticket size | Large value | Small value |

| Rails | Replaces RTGS, multi-CBDC | Mobile wallets, cards |

| Examples | Project Agora, Project Cedar, Project Helvetia | e-CNY, digital yuan, BOJ Phase 3 |

| Issuance model | Direct | 2-tier (central bank → commercial bank → user) |

| Anonymity | Identified | Small-amount anonymous, high-value identified |

| Interest | Sometimes (financial stability impact) | Almost never |

The 2-tier model dominates retail. The central bank guarantees issuance, redemption, and settlement finality; commercial banks own KYC, AML, and the customer interface. This model preserves the existing banking stack while introducing CBDC, so Korea, Japan, the EU, and China all adopted it.

Key design choices:

- **Account vs token**: account-based forces KYC but weakens anonymity. Token-based offers anonymity but complicates recovery on loss. e-CNY is a token-account hybrid.

- **Online vs offline**: offline settlement happens device-to-device over NFC. e-CNY supports offline and BOJ Phase 3 piloted offline.

- **Interest**: most retail CBDCs pay 0% due to stability concerns. Some wholesale designs carry the short-term policy rate.

- **Anonymity caps**: small amounts (e.g. `€500/month`) stay anonymous; larger amounts require KYC. This is the standard ECB Digital Euro design.

Chapter 2 · PBoC e-CNY — What `1.8조 위안` Cumulative Volume Means

Chinas e-CNY (Digital Currency Electronic Payment, DCEP) is the most advanced retail CBDC. The PBoC stood up its Digital Currency Research Institute in 2014; pilots in Shenzhen, Suzhou, and Xian began in 2020. By Q1 2026 cumulative transaction volume crossed `1.8조 위안`.

Key features:

- **2-tier structure**: PBoC issues; ICBC, CCB, ABC, BoC and two others operate user wallets.

- **0% interest**: financial stability concerns mandate 0%.

- **Anonymity tiers**: four wallet tiers (SIM, phone number, real-name, bank-linked) define daily caps.

- **Offline payments**: NFC and QR, no internet needed.

- **2022 Beijing Winter Olympics**: foreign visitors received e-CNY wallets; about 900M yuan in transactions.

e-CNY-style token transfer (conceptual, not the actual implementation)

from dataclasses import dataclass

from datetime import datetime

@dataclass

class ECNYToken:

token_id: str # token serial

amount_yuan: float # amount (yuan)

issuer_bank: str # operator (ICBC, CCB, etc.)

holder_wallet: str # holder wallet id

anonymous_tier: int # 1-4 (4 = highest KYC)

issued_at: datetime

def transfer_ecny(token: ECNYToken, recipient_wallet: str, amount: float):

if amount > token.amount_yuan:

raise ValueError("Insufficient balance")

Enforce daily caps by anonymity tier

daily_cap = {1: 500, 2: 10_000, 3: 50_000, 4: None}[token.anonymous_tier]

if daily_cap and amount > daily_cap:

raise ValueError(f"Daily cap exceeded: {daily_cap} yuan")

Send transfer message to PBoC settlement system

return {

"from": token.holder_wallet,

"to": recipient_wallet,

"amount": amount,

"settled_at": datetime.utcnow().isoformat(),

"issuer": token.issuer_bank,

}

The political subtext of e-CNY is reduced dependence on USD rails. It opens settlement channels outside SWIFT and CHIPS — especially with Belt and Road (BRI) partners.

Chapter 3 · Bank of Korea CBDC Simulation — Phase 2 With 100 Citizens

The Bank of Korea published its CBDC simulation plan in 2020. Phase 1 (technical validation) and Phase 2 (field pilot) run across 2024-2026. Phase 2 places real transactions in the hands of **100 citizens, four pilot banks (Woori, Shinhan, Hana, IBK), and a limited merchant set**.

Phase 2 structure:

- **Issuer**: Bank of Korea (direct issuance).

- **Operating banks**: Woori, Shinhan, Hana, IBK (small set).

- **Users**: 100 citizens, pre-registered with full KYC.

- **Merchants**: select restaurants, convenience stores, online shops.

- **Limits**: 50,000 KRW/day, 1,000,000 KRW cumulative.

- **Payment**: mobile wallet app, QR.

The stack is **centralized rather than DLT-based**. A 2022 BoK paper cited DLT throughput as inadequate for retail and concluded a centralized ledger is more appropriate. The global trend matches — e-CNY, digital yen, and Digital Euro all use centralized or permissioned-DLT designs.

Bank of Korea CBDC Phase 2 — system configuration (conceptual)

network:

issuer: Bank of Korea

operators:

- Woori Bank

- Shinhan Bank

- Hana Bank

- IBK

ledger_type: centralized_with_audit_log

consensus: not_applicable

tps_target: 2000

user_wallet:

kyc_level: full

daily_limit_krw: 50000

cumulative_limit_krw: 1000000

offline_supported: false

settlement:

finality: instant

reconciliation: end_of_day

refund_path: bank_initiated_within_72h

The BoKs three policy goals: (1) diversify payment rails as cash usage falls, (2) deepen financial inclusion, and (3) settlement efficiency (`<5초 settlement`). A live issuance decision is unlikely before 2027.

Chapter 4 · BOJ Digital Yen — Phases 1-3 and the PSC Track

The BOJ published its digital yen feasibility report in 2020 and ran Phase 1-3 proof-of-concepts from 2023 to 2026.

- **Phase 1 (2021-2022)**: validate basic functions — issuance, redemption, transfers.

- **Phase 2 (2022-2023)**: extended scenarios — diverse devices, offline payment, anonymity caps.

- **Phase 3 (2023-2026)**: retail scenarios, merchant interfaces, foreign tourist payment.

Phase 3s focus is **dividing KYC/AML responsibilities under the 2-tier model**. The BOJ handles issuance and redemption while megabanks (MUFG, Mizuho, SMBC, Resona) own user interface, KYC, and AML. The framework matches Japans PSC (Payment Stablecoin) license — private issuers carry identical obligations.

As of May 2026 the BOJ has deferred a live issuance decision. Japan still pays 30%+ in cash and operators like PayPay, LINE Pay, and Rakuten Pay already deliver RTP UX. The strategic motive for digital yen sits in foreign tourist payments and cross-border use — JPY-pegged stablecoins under the PSC license cover the same gap.

Chapter 5 · ECB Digital Euro — Preparation Phase 2025-2027

The ECB launched the Preparation Phase for the Digital Euro in October 2023. Across 2-3 years it finalizes technical, legal, and operational standards, then takes an issuance decision after 2027. If approved, another 1-2 years of pilots follow before launch.

Key design decisions:

- **2-tier model**: ECB issues; member-state commercial banks own KYC and interface.

- **Anonymity caps**: small payments stay anonymous (e.g. `€500/transaction`), large amounts require KYC.

- **Interest**: 0% to protect financial stability.

- **Holding cap**: roughly `€3000` per person under review — preventing mass migration of bank deposits.

- **Offline payments**: NFC and device-to-device supported.

- **Client API**: open standard integrated with PSD3 and SEPA Instant Credit Transfer.

The ECBs policy logic centers on defending against US bigtech wallets (Apple Pay, Google Pay) and foreign stablecoins (USDC, USDT) eating into EU payments. MiCAs EUR cap shares that motivation — a regulatory package designed to protect EU monetary sovereignty.

Chapter 6 · Fed FedNow vs a Hypothetical Digital Dollar

The US took a different path. The Fed shipped FedNow in July 2023 — a 24/7, real-time, interbank settlement system. By May 2026 more than 1,000 banks participate with hundreds of thousands of transactions daily.

FedNow **is not a CBDC**. It is a real-time payments rail that moves commercial bank deposits. The Fed has repeatedly stated it lacks the statutory authority to issue a digital dollar — that requires congressional legislation.

flowchart LR

USER1[User A] --> BANK1[Bank A]

BANK1 --> FEDNOW{FedNow Service}

FEDNOW --> BANK2[Bank B]

BANK2 --> USER2[User B]

FEDNOW -.real-time settlement.-> FED[Federal Reserve]

Research is active:

- **Project Hamilton (2020-2022)**: Fed Boston + MIT DCI. Two prototypes (centralized and distributed). Reached about 1.7M TPS.

- **Project Cedar (2022)**: NY Fed. Studied wholesale CBDC impact on FX settlement and confirmed atomic settlement feasibility.

- **Project Cedar x Project Ubin (2023)**: NY Fed + MAS Singapore. Cross-border wholesale CBDC.

In 2024-2025 the US Congress saw bills like the "CBDC Anti-Surveillance State Act" — concerns that retail CBDC would expose individual payment data to the government. The US settled on **private stablecoins (USDC, PYUSD) as de facto digital dollars**. The GENIUS Act and the Clarity for Payment Stablecoins Act are nearing passage.

Chapter 7 · BIS Project Agora — Multi-CBDC and Tokenized Deposits

The BIS Innovation Hubs Project Agora (2024-2026) is the most ambitious multi-CBDC project. Seven central banks (NY Fed, ECB, BoE, SNB, BoJ, BoK, BoF) co-design a single platform that bridges wholesale CBDC with tokenized deposits.

The core idea is **integrating wholesale CBDC and tokenized commercial bank deposits in a single settlement layer**.

- Wholesale CBDC: central bank-issued, interbank settlement.

- Tokenized deposits: commercial bank-issued, KYCed customer deposits.

- Unified settlement: atomic, 24/7, multi-currency.

Project Agora is a **simulation environment hosted by BIS** — no real funds move. Some participants may carry out live PoCs in 2026-2027.

Project mBridge is different. China, Hong Kong, Thailand, and the UAE participate in **live cross-border wholesale CBDC settlement**. In 2024 BIS transferred operational ownership to the four central banks. Because it bypasses SWIFT, it is a candidate alternative for the USD payment network.

Chapter 8 · The Stablecoin Market — The Shape of `$170B`

Private stablecoins exceeded `$170B` in market cap by May 2026. The distribution is heavily skewed.

| --- | --- | --- | --- | --- |

| DAI | MakerDAO | `$5B+` | USD 1:1 | crypto over-collateralized + RWA |

| GHO | Aave | `$200M+` | USD 1:1 | crypto over-collateralized |

USDT leads in size but its reserve disclosure trails USDCs. USDC publishes monthly attestations of BlackRocks Circle Reserve Fund (a USD government money market fund). USDC briefly depegged to `$0.88` during the March 2023 SVB collapse — Circles `$3.3B` deposit at SVB became public, then recovered.

BUSD wound down new issuance in February 2023 following a NYDFS order and fully sunset in 2024. Paxos transitioned to PYUSD (with PayPal) and its own USDP.

Chapter 9 · USDC ERC-20 Mint/Burn Flow — Circle Reserve Fund

USDC is an ERC-20 token issued across Ethereum, Solana, Arbitrum, Base, and more — 15+ chains by May 2026. Circles CCTP (Cross-Chain Transfer Protocol) enables native cross-chain transfers.

A conceptual mint/burn flow:

// USDC ERC-20 (conceptual — real contracts are richer)

pragma solidity ^0.8.0;

contract USDC {

address public minter; // Circle (authorized issuer)

mapping(address => uint256) public balanceOf;

uint256 public totalSupply;

modifier onlyMinter() {

require(msg.sender == minter, "Only minter");

}

// User wires USD to Circle, Circle mints

function mint(address to, uint256 amount) external onlyMinter {

balanceOf[to] += amount;

totalSupply += amount;

emit Transfer(address(0), to, amount);

}

// User burns USDC, Circle pays USD

function burn(address from, uint256 amount) external onlyMinter {

require(balanceOf[from] >= amount, "Insufficient");

balanceOf[from] -= amount;

totalSupply -= amount;

emit Transfer(from, address(0), amount);

}

event Transfer(address indexed from, address indexed to, uint256 value);

}

Reserves sit in BlackRocks Circle Reserve Fund (ticker USDXX). The fund holds only US T-bills (≤3-month maturity) and cash. Circle publishes monthly attestation reports (Deloitte).

The advantage is that reserves are mark-to-market and almost 1:1 matched to USDC supply. Post-SVB Circle reduced bank deposit exposure and pushed T-bills to 80%+ of reserves.

Chapter 10 · USDT Tether — Reserve Composition and Redemption Tantamount

Tether (USDT) leads the market but operates differently from USDC. Headquartered in the British Virgin Islands, issued by Tether Holdings Limited. Reserve attestations come quarterly (BDO Italia) rather than monthly.

Approximate reserve composition (Q1 2026):

- US Treasury bills: `~75%`

- Reverse repo: `~10%`

- Cash and bank deposits: `~5%`

- Corporate bonds: `~3%`

- Precious metals (gold): `~3%`

- Bitcoin: `~3%`

- Other (secured loans): `~1%`

USDT redemption is **tantamount to USD 1:1**, but the workflow is involved. Minimum `$100,000` per redemption, KYC/AML, and only direct-contracted approved users may redeem. Retail users normally exit USDT by selling for USD on exchanges.

That gap explains USDTs brief depeg to `$0.95` during the May 2022 Terra/Luna collapse — redemption immediacy was weaker, and the market priced in doubt.

Chapter 11 · DAI MakerDAO — CDPs and Crypto Over-Collateralization

DAI is a different beast. MakerDAO issues this decentralized stablecoin backed by **crypto over-collateralization**. Users lock ETH, WBTC, or stETH and may draw DAI up to ~`66%` of collateral value.

MakerDAO CDP (Collateralized Debt Position) — conceptual

class CDP:

def __init__(self, collateral_type, collateral_amount, dai_drawn):

self.collateral_type = collateral_type # "ETH-A", "WBTC-A", etc.

self.collateral_amount = collateral_amount

self.dai_drawn = dai_drawn

self.liquidation_ratio = 1.5 # 150% (ETH-A baseline)

def collateral_ratio(self, oracle_price_usd):

collateral_value = self.collateral_amount * oracle_price_usd

if self.dai_drawn == 0:

return float("inf")

return collateral_value / self.dai_drawn

def is_liquidatable(self, oracle_price_usd):

return self.collateral_ratio(oracle_price_usd) < self.liquidation_ratio

def liquidate(self, oracle_price_usd, liquidation_penalty=0.13):

Auction the collateral with a 13% penalty

liquidated_collateral_usd = self.dai_drawn * (1 + liquidation_penalty)

liquidated_amount = liquidated_collateral_usd / oracle_price_usd

self.collateral_amount -= liquidated_amount

self.dai_drawn = 0

return liquidated_amount

In 2024 MakerDAO launched its Endgame Plan and began migrating DAI toward USDS. The RWA (real-world asset) share grew — Maker holds more than half its reserves in US Treasuries. The name says "decentralized" but asset composition increasingly resembles USDC.

GHO is Aaves take. Users borrow GHO against deposited collateral on Aave; risk parameter tuning maintains the peg.

Chapter 12 · PYUSD PayPal — Bigtech Enters Stablecoins

PYUSD launched in August 2023 — a PayPal-issued USD stablecoin built with Paxos. It runs on Ethereum and Solana with a `$1B+` market cap as of May 2026.

PYUSD matters for two reasons.

- **Bigtech payments integration**: PayPal and Venmo users can pay, send, or remit with PYUSD. PYUSD-to-USD redemption is one tap inside the PayPal app.

- **Regulatory fit**: NYDFS license, Paxos trust structure, T-bill reserves. Designed to minimize SEC dispute risk.

flowchart LR

USER[User] -->|USD deposit| PAYPAL[PayPal]

PAYPAL -->|mint request| PAXOS[Paxos Trust]

PAXOS -->|reserve custody| FRB[NY Fed Reverse Repo]

PAXOS -->|PYUSD issue| CHAIN[ETH/Solana]

CHAIN --> USER

PYUSDs entrance broke an asymmetry. USDC and USDT funneled new mints almost entirely through Coinbase and Kraken; PayPal can issue directly to its 400M active users. As of May 2026 PYUSDs cap is still 1/100th of USDTs — the bigtech impact remains potential.

Chapter 13 · EU MiCA Stablecoin — EUR Cap and E-money Tokens

MiCA (Markets in Crypto-Assets Regulation), effective June 2024, is the EUs unified crypto-asset framework. Stablecoins split into two:

- **EMT (E-money Token)**: pegged to a single fiat. USDC, EURC.

- **ART (Asset-Referenced Token)**: pegged to a basket. (The model Libra/Diem aimed at.)

EMT issuer obligations:

- Hold an e-money license (or credit institution license) in an EU member state.

- 100% reserves in T-bills, central bank deposits, or other high-quality assets.

- Daily redemption guarantee.

- File a white paper.

- AML/CFT including the Travel Rule.

The most talked-about rule is the **EUR-denominated EMT cap**. Non-EUR EMTs (e.g. USDC) face a `€200M daily volume cap` inside EU member states — issuance must stop once breached. The intent is plain: prevent USDC from eating the EU payment market and protect ECB monetary sovereignty.

Circle obtained ACPR (Autorité de Contrôle Prudentiel et de Résolution) e-money licensing in France in 2024 and supplies USDC and EURC into the EU legally. Tether did not get a license and from November 2024 onward sees USDT delisted from EU exchanges progressively.

Chapter 14 · Korea Virtual Asset User Protection Act and KRW Stablecoin Debate

Korea brought its Virtual Asset User Protection Act into force on July 19, 2024. Exchange obligations are the core:

- Hold 80%+ of customer deposits at a bank, segregated.

- Minimum 3B KRW of equity capital.

- ISMS-P certification.

- Mandatory indemnity (minimum 3B KRW) for hacks/incidents.

- Market manipulation and insider trading bans (mirroring capital markets law).

A KRW stablecoin still has **no direct statutory basis as of May 2026**. The Act covers exchange and intermediary duties, not issuance. A new bill would need to legalize a KRW-pegged stablecoin issued domestically.

Issues under FSC and BoK review through 2025-2026:

- **Issuer eligibility**: banks only, or trust companies and fintechs as well.

- **Reserve composition**: 100% sovereign bonds and central bank deposits, or some corporates allowed.

- **Redemption**: daily guarantee or business-day basis.

- **Anonymity**: standard crypto level or CBDC-grade KYC.

- **Overlap with STO**: a KRW-pegged STO may trigger capital markets law versus crypto law.

KB, Shinhan, Hana, Woori, and NH Nonghyup all explore KRW-pegged settlement tokens under the STO track. The adjacent payment token can effectively serve as a KRW stablecoin. Legislation could land in H2 2026.

Chapter 15 · Japan PSC License — Mizuho, MUFG, SBI

Japan amended the Payment Services Act in June 2023 and introduced the PSC (Payment Stablecoin) license. PSCs are digital assets that guarantee 1:1 redemption to the pegged fiat.

Eligible PSC issuers:

- Banks (megabanks: MUFG, Mizuho, SMBC).

- Funds-transfer service providers.

- Trust companies.

Core obligations:

- 100% reserves in trust or bank deposits.

- Daily redemption guarantee.

- AML/CFT, with explicit Travel Rule.

- User priority in issuer bankruptcy.

Representative prep work:

- **Mizuho Digital Yen**: Mizuho Trust Bank as the issuing entity; JPY stablecoin for inter-corporate settlement.

- **MUFG Progmat Coin**: JPY stablecoin on MUFGs Progmat platform; paired with tokenized real estate and STOs.

- **SBI VC Trade**: SBI Group distributes USDC in Japan (Circle partnership).

- **三井住友 SMBC**: JPY-pegged settlement token under STO review.

Japan PSC license mapping (conceptual)

psc_license:

issuer: Mizuho Trust & Banking

pegged_currency: JPY

reserve_composition:

cash_at_bank_of_japan: 60%

jpy_government_bonds_3m: 35%

cash_at_correspondent_banks: 5%

redemption_sla: same_business_day

daily_redemption_limit_jpy: unlimited_for_kyc

aml_cft:

travel_rule_compliance: true

kyc_level: full

bankruptcy_protection:

user_priority_in_bankruptcy: true

Japans PSC is the most conservative globally. Issuance is limited to banks and trust companies, and reserve rules are strict. In return, JPY stablecoin circulation rests on a clear statutory basis — the opposite of the US legislative drag or the EU squeeze on USD-denominated stablecoins.

Chapter 16 · Project Agora Code Flow — Wholesale CBDC Bridge

The wholesale CBDC bridge in Project Agora runs in an isolation zone. One bank receives EUR while another sends USD via an atomic swap settled in wholesale CBDC.

Project Agora-style atomic settlement (conceptual)

from dataclasses import dataclass

from typing import Optional

@dataclass

class CBDCLedger:

currency: str # "EUR", "USD", "JPY", "KRW", etc.

issuer: str # "ECB", "Fed", "BOJ", "BOK"

balances: dict # bank_id -> amount

def transfer(self, from_bank, to_bank, amount):

if self.balances.get(from_bank, 0) < amount:

raise ValueError("Insufficient balance")

self.balances[from_bank] -= amount

self.balances[to_bank] = self.balances.get(to_bank, 0) + amount

@dataclass

class AtomicSwap:

leg1_ledger: CBDCLedger

leg1_from: str

leg1_to: str

leg1_amount: float

leg2_ledger: CBDCLedger

leg2_from: str

leg2_to: str

leg2_amount: float

def execute(self) -> Optional[str]:

PvP (Payment versus Payment) — settle both legs atomically, rollback on failure

snapshot_l1 = dict(self.leg1_ledger.balances)

snapshot_l2 = dict(self.leg2_ledger.balances)

try:

self.leg1_ledger.transfer(self.leg1_from, self.leg1_to, self.leg1_amount)

self.leg2_ledger.transfer(self.leg2_from, self.leg2_to, self.leg2_amount)

return "settled"

except Exception:

self.leg1_ledger.balances = snapshot_l1

self.leg2_ledger.balances = snapshot_l2

raise

The point is **eliminating Herstatt risk in FX settlement**. After the 1974 Bankhaus Herstatt collapse, the temporal lag risk in FX became canonical. PvP atomic settlement removes the one-sided exposure.

Chapter 17 · Settlement Speed Compared — Meaning of `<5초 settlement`

Speed and finality side by side:

| --- | --- | --- | --- |

| FedNow | `<20초` | Instant | 24/7 |

| SEPA Instant | `<10초` | Instant | 24/7 |

| Digital Euro (planned) | `<5초` | Instant | 24/7 |

| e-CNY | `<3초` | Instant | 24/7 |

| USDC on Solana | `<2초` | Probabilistic | 24/7 |

CBDC and RTP rails (FedNow, SEPA Instant) deliver fundamentally similar speeds. The difference lies in the underlying claim — CBDCs are direct central bank liabilities; RTP moves commercial bank deposits. Credit risk differs.

Chapter 18 · Settlement Risk — Credit, Settlement, Liquidity

Settlement risk breaks into three components.

- **Credit risk**: counterparty fails to deliver. Bank deposits inherit bank credit risk. Central bank money (CBDC, cash) carries none.

- **Settlement risk**: only one side delivers. Resolved through PvP and DvP.

- **Liquidity risk**: insufficient balance or liquidity at settlement. Smoothed by central bank standing facilities.

Mapping CBDCs and stablecoins onto that frame:

| --- | --- | --- | --- | --- |

This frame explains why BIS Project Agora unifies wholesale CBDC with tokenized deposits — to the user it is the same payment, but whether the central bank absorbs credit risk diverges.

Chapter 19 · BoK CBDC and KRW Stablecoin — Conflict Scenarios

Three scenarios for Koreas market if BoK CBDC and a future KRW stablecoin coexist.

**Scenario A — CBDC dominates.**

- BoK CBDC ships at scale and becomes the standard retail rail.

- KRW stablecoin stays in niche markets (STO, DeFi).

- Government access to payment data becomes a political issue.

**Scenario B — Stablecoin dominates.**

- BoK CBDC slips on political or technical hurdles.

- KRW stablecoin scales fast through bank consortia.

- BoK issues only wholesale CBDC; retail goes to the private sector.

**Scenario C — Coexistence.**

- BoK CBDC owns small-value payments and financial inclusion.

- KRW stablecoin owns STO, cross-border, DeFi.

- 1:1 convertibility guaranteed between them.

BIS recommends Scenario C. Project Agoras blueprint — wholesale CBDC plus tokenized deposits plus retail CBDC in one infra — is precisely Scenario Cs implementation.

Chapter 20 · Japan PSC vs BOJ Digital Yen — A Cooperative Model

Japan took yet another path. The BOJ pauses retail digital yen issuance while PSC (private stablecoins) fill the gap.

flowchart TD

BOJ[Bank of Japan] --> BOJ_CBDC[Wholesale CBDC, under review]

BOJ --> POLICY[PSC licensing and supervision]

POLICY --> MIZUHO[Mizuho Digital Yen]

POLICY --> MUFG[MUFG Progmat Coin]

POLICY --> SBI[SBI USDC distribution]

MIZUHO --> ENTERPRISE[Inter-corporate settlement]

MUFG --> STO[Tokenized real estate and STOs]

SBI --> CROSS[Cross-border remittance and CEX]

The strength of this model is **balancing private innovation with central bank oversight**. PSC issuers pioneer use cases (B2B, STO, CEX); the BOJ guards safety through licensing and reserve rules. Japans PSC is more conservative than US/EU regimes, but it fits Japans market (high cash usage, trust-based society).

Korea could borrow the Japan model in legislating a KRW stablecoin — limit issuance to banks and trust companies, demand 100% reserves at the BoK or in sovereigns, and tighten user protection.

Chapter 21 · Cross-Border Remittance — Project mBridge vs Stablecoins

International remittance is where CBDCs and stablecoins create most value. The legacy SWIFT/correspondent banking model carries known limits:

- Settlement time: 2-5 business days.

- Fees: `$25-50/transfer` plus 2-3% FX margin.

- Transparency: tracking is hard.

- Hours: business hours only.

Project mBridge (China, Hong Kong, Thailand, UAE) exchanges wholesale CBDC directly, settling cross-border within `<10초` at near-zero cost (central bank operated).

USDC and USDT compete in the same lane. Circles CCTP supports native cross-chain USDC transfers; USDT on Tron settles at roughly `~$1` in fees.

| --- | --- | --- | --- |

| Project mBridge | `<10초` | `~0` | Central bank only |

| USDC + CCTP | `<30초` | `<$1` | Issuer + chain |

| USDT on Tron | `<10초` | `~$1` | Issuer + chain |

| RippleNet (XRPL) | `<5초` | `<$0.01` | Validator risk |

Stablecoins shine on **24/7 availability and low fees**. They carry more credit risk than mBridge though — issuer and chain risk stack up.

Chapter 22 · MiCA, NYDFS, FSA, FSC Compared — Regulatory Matrix

Stablecoin regulation differs across regions.

| --- | --- | --- | --- | --- |

| EUR cap | — | `€200M/day` (non-EUR coins) | — | — |

Chapter 23 · Operating Checklist — Stablecoin Issuers

What stablecoin issuers should verify in 2026:

1. **100% reserves**: issued supply equals backing. T-bills and cash heavy.

2. **Reserve diversification**: avoid single-bank concentration (SVB lesson).

3. **Attestation cadence**: monthly (USDC), quarterly (USDT). Monthly is moving to standard.

4. **Redemption SLA**: daily for KYCed users.

5. **AML/CFT**: Travel Rule, FATF Recommendation 16.

6. **Multi-chain issuance**: Ethereum, Solana, Polygon, Arbitrum, Base, more.

7. **CCTP or equivalent**: native cross-chain transfer standard.

8. **Regulatory engagement**: licensing in each jurisdiction.

9. **Incident response**: depeg, hack, censorship runbooks.

10. **Smart contract audits**: OpenZeppelin, Trail of Bits each upgrade.

11. **Blacklist/whitelist**: OFAC SDN blocking (standard after Tornado Cash).

12. **Tax reporting**: US IRS 1099, EU MiCA requirements.

13. **User protection**: pages, terms, complaints channels.

14. **Bank-run prep**: liquidity buffer for sudden mass redemption.

The 14 items together encode lessons from SVB, Terra/Luna, and BUSDs sunset.

Chapter 24 · Operating Checklist — CBDC Operating Banks

What operating banks (Woori, Shinhan, Hana, IBK, MUFG, Mizuho, etc.) should verify under a 2-tier retail CBDC:

1. **KYC tiers**: design 1-4 tiers of anonymity caps.

2. **Daily limits**: per-user and per-merchant.

3. **AML/CFT monitoring**: real-time suspicious-activity detection.

4. **Offline payment support**: NFC and device-to-device SDK.

5. **Customer interface**: mobile app, web, ATM integration.

6. **Loss recovery**: procedures for restoring balance on device loss.

7. **Merchant settlement**: CBDC direct vs convert to bank deposit.

8. **Interoperability**: payments between users on different operators.

9. **Fee model**: charge merchants vs zero-fee.

10. **Dispute resolution**: refund and chargeback SLAs.

11. **Operational risk**: downtime and incident response.

12. **Data protection**: scope of payment data shared with government/central bank.

13. **Financial impact**: deposit outflow modeling.

14. **International cooperation**: foreign tourist and cross-border support.

These obligations mirror US AML/BSA duties. The new twist is that the payment instrument is CBDC — the central bank becomes both issuer and ultimate settlement agent.

Chapter 25 · Monetary Sovereignty and Digital Money

CBDCs and stablecoins are not just payment tools. They are about **monetary sovereignty**.

- **US**: legislative delay parks retail CBDC. Private USDC and PYUSD operate as de facto digital dollars; the USD reach expands through private rails.

- **EU**: ECB Digital Euro defends monetary sovereignty; MiCAs EUR cap fences off foreign stablecoins.

- **China**: e-CNY builds an alternative to SWIFT; mBridge ties payments to BRI partners.

- **Japan**: balances PSC with BOJ CBDC; internationalizes JPY through stablecoins.

- **Korea**: BoK CBDC plus KRW stablecoin legislation under study; balances sovereignty with payments innovation.

The 2026 takeaway: **there is no single answer**. The US, EU, China, Japan, and Korea each go their own way, shaped by monetary sovereignty, political system, and financial market structure.

Chapter 26 · Synthesis — Payments Today and the Next Five Years

A one-sentence summary of May 2026: **the first five years in which central banks and private firms simultaneously issue tokenized money**.

The next five years hinge on:

1. **US stablecoin legislation**: GENIUS Act and Clarity for Payment Stablecoins Act.

2. **ECB Digital Euro decision**: after 2027.

3. **BoK CBDC live issuance**: 2027-2028.

4. **BOJ digital yen decision**: after 2027.

5. **e-CNY internationalization**: mBridge expansion across BRI.

6. **MiCA EUR cap impact**: USDC EU market share.

7. **PSC license market formation**: Mizuho, MUFG, SBI plus newcomers.

8. **KRW stablecoin legislation**: FSC and BoK alignment.

9. **Project Agora and mBridge expansion**: multi-country wholesale CBDC.

10. **Bigtech stablecoins**: PYUSD, Apple Cash, Meta(?) entries.

Which of those land determines the payment landscape in 2030. CBDCs and stablecoins likely become complements, not competitors — users get the same payment UX while central banks, private issuers, and banks divide roles backstage. That is Project Agoras blueprint.

One last point. **`<5초 settlement`** is not merely a technical milestone. It signals structural shifts in credit risk, settlement timing risk, and cross-border cost. The money of 2026 is tokenized — and the path forward will not reverse.

References

- BIS — Project Agora — [https://www.bis.org/about/bisih/topics/cbdc/agora.htm](https://www.bis.org/about/bisih/topics/cbdc/agora.htm)

- BIS — Project mBridge — [https://www.bis.org/about/bisih/topics/cbdc/mcbdc_bridge.htm](https://www.bis.org/about/bisih/topics/cbdc/mcbdc_bridge.htm)

- BIS Innovation Hub — [https://www.bis.org/about/bisih/](https://www.bis.org/about/bisih/)

- IMF — Digital Money — [https://www.imf.org/en/Topics/fintech](https://www.imf.org/en/Topics/fintech)

- Bank of Korea — CBDC simulation — [https://www.bok.or.kr/portal/main/contents.do?menuNo=200068](https://www.bok.or.kr/portal/main/contents.do?menuNo=200068)

- Bank of Korea — Digital Currency research — [https://www.bok.or.kr/portal/bbs/B0000347/list.do?menuNo=200792](https://www.bok.or.kr/portal/bbs/B0000347/list.do?menuNo=200792)

- BOJ — Central Bank Digital Currency — [https://www.boj.or.jp/en/paym/digital/index.htm](https://www.boj.or.jp/en/paym/digital/index.htm)

- ECB — Digital Euro — [https://www.ecb.europa.eu/euro/digital_euro/html/index.en.html](https://www.ecb.europa.eu/euro/digital_euro/html/index.en.html)

- Federal Reserve — FedNow Service — [https://www.frbservices.org/financial-services/fednow](https://www.frbservices.org/financial-services/fednow)

- Federal Reserve — CBDC research — [https://www.federalreserve.gov/central-bank-digital-currency.htm](https://www.federalreserve.gov/central-bank-digital-currency.htm)

- NY Fed — Project Cedar — [https://www.newyorkfed.org/aboutthefed/nyic/project-cedar](https://www.newyorkfed.org/aboutthefed/nyic/project-cedar)

- PBoC — e-CNY White Paper — [http://www.pbc.gov.cn/en/3688110/3688172/4157443/4293696/index.html](http://www.pbc.gov.cn/en/3688110/3688172/4157443/4293696/index.html)

- Circle — USDC — [https://www.circle.com/en/usdc](https://www.circle.com/en/usdc)

- Circle — Reserve Composition — [https://www.circle.com/en/transparency](https://www.circle.com/en/transparency)

- Tether — USDT — [https://tether.to/](https://tether.to/)

- PayPal — PYUSD — [https://www.paypal.com/us/digital-wallet/manage-money/crypto/pyusd](https://www.paypal.com/us/digital-wallet/manage-money/crypto/pyusd)

- Paxos — PYUSD whitepaper — [https://paxos.com/pyusd/](https://paxos.com/pyusd/)

- MakerDAO — DAI — [https://makerdao.com/en/](https://makerdao.com/en/)

- Aave — GHO — [https://gho.aave.com/](https://gho.aave.com/)

- EU MiCA Regulation — [https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A32023R1114](https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A32023R1114)

- ESMA — Crypto-Assets — [https://www.esma.europa.eu/esmas-activities/digital-finance-and-innovation/markets-crypto-assets-regulation-mica](https://www.esma.europa.eu/esmas-activities/digital-finance-and-innovation/markets-crypto-assets-regulation-mica)

- FSC Korea — Virtual Asset User Protection Act — [https://www.fsc.go.kr/](https://www.fsc.go.kr/)

- Japan FSA — Amended Payment Services Act — [https://www.fsa.go.jp/](https://www.fsa.go.jp/)

- NYDFS — Virtual Currency — [https://www.dfs.ny.gov/virtual_currency_businesses](https://www.dfs.ny.gov/virtual_currency_businesses)

- FATF — Travel Rule — [https://www.fatf-gafi.org/en/topics/virtual-assets.html](https://www.fatf-gafi.org/en/topics/virtual-assets.html)

- BIS — CBDC Survey 2024 — [https://www.bis.org/publ/bppdf/bispap147.htm](https://www.bis.org/publ/bppdf/bispap147.htm)